Herein,　a　novel　flame　retardant　and　smoke　suppression　auxiliaries　was　synthesized　with　the　motivation　of　sustainability　strategy.　Porous　diatomite　(p-DIA)　as　a　purely　natural　raw　material　and　melamine　formaldehyde-phytic　acid　(MFPA)　as　a　synergist　to　produce　DMFPA,　which　acts　as　the　novel　auxiliaries　to　endow　epoxy　resin　(EP)　with　excellent　fire　safety.　The　thermal　stability　of　EP　composites　with　15　wt%　DMFPA　was　improved,　as　evidenced　by　a　31.0%　reduction　in　its　maximum　thermal　decomposition　rate　and　an　enhancement　of　residual　char　to　22.7　wt%.　Moreover,　EP　composites　also　exhibited　superior　flame　retardant　and　smoke　reduction　properties,　as　reflected　by　its　peak　heat　release　rate　(PHRR),　peak　smoke　release　rate　(PSPR),　peak　CO　release　rate　and　smoke　factor　(SF)　that　were　56.5%,　56.3%,　58.7%　and　77.7%　less　than　those　of　unmodified　EP,　respectively.　These　results　correlated　strongly　with　the　powerful　adsorption　of　smoke　and　flammable　debris　by　porous　diatomite,　the　physical　barrier　effect　of　the　highly　stable　expanded　char　layer　facilitated　by　DMFPA,　the　dilution　effect　of　non-flammable　gases　resulted　from　pyrolysis　by　melamine　and　the　free　radicals　quenching　effect　produced　by　phytic　acid.　©　2024　The　Society　of　Powder　Technology　Japan